DETAILED DESCRIPTION One embodiment of our invention shown in FIGS.
1-5 includes a conduit 10 having a middle section surrounded by three groups of permanent magnets 12, 14, and 16 that are arranged in a helical pattern about a periphery of the conduit 10.
Conventional fittings 18 and 20 are formed at opposite ends of the conduit 10 to provide connections within lines conveying fuel or other fluids that can benefit from treatment by magnetic forces.
Of course, other known fittings could also be used to similarly connect the conduit 10 along a path of fluid flow.
The conduit 10 can be made of copper or other nonmagnetic materials that are permeable to magnetic fields.
A central axis 24 is centered within the conduit and extends along the conduit's length.
The three groups of magnets 12, 14, and 16 are encapsulated within a casing 22 that can be made of polypropylene or similar moldable dielectric materials.
Each of the groups of magnets includes three bar magnets, shown for example in FIG.
2 as magnets 26, 28, and 30 of group 12.
The magnets 26, 28, and 30 include like pole faces 32, 34, and 36 located next to conduit 10 and the opposite like pole faces 38, 40, and 42 located away from the conduit.
Respective north and south magnetic poles, indicated as "N" and "S", are located on radial lines 44, 46, and 48 that extend in a transverse plane 50 from the central axis 24 of the conduit.
The magnets 26, 28, and 30 are oriented at even one-hundred-twenty degree intervals about the central axis 24.
FIG.
3 is a diagram showing field boundaries 52, 54, and 56 of the respective magnets 26, 28, and 30 in the transverse plane 50.
The field boundaries 52, 54, and 56 are compressed within a space between the magnets, producing focused magnetic fields within the conduit 10.
However, the magnetic fields do not exhibit uniform intensity within the conduit.
Field lines of the magnetic fields are more highly concentrated near the field boundaries 52, 54, and 56.
The other two groups of magnets 14 and 16 produce similarly concentrated magnetic fields
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Liquid Purification 
